Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Capital Stock, Common	Additional Paid-in Capital	Retained Earnings	Treasury Stock
Balance at Dec. 31, 2019	$ 684,659	$ 907	$ 4,141	$ 826,666	$ (147,055)
Net income	70,806	0	0	70,806	0
Dividends on common stock	(6,502)	0	0	(6,502)	0
Repurchases of common stock	(26,139)	0	0	0	(26,139)
Stock-based compensation, net of tax	1,510	0	189	0	1,321
Balance at Dec. 31, 2020	724,334	907	4,330	890,970	(171,873)
Net income	79,277	0	0	79,277	0
Dividends on common stock	(45,872)	0	0	(45,872)	0
Repurchases of common stock	(31,540)	0	0	0	(31,540)
Stock-based compensation, net of tax	903	0	(189)	0	1,092
Balance at Dec. 31, 2021	727,102	907	4,141	924,375	(202,321)
Net income	133,584	0	0	133,584	0
Dividends on common stock	(6,318)	0	0	(6,318)	0
Stock-based compensation, net of tax	1,109	0	24	0	1,085
Balance at Dec. 31, 2022	$ 855,477	$ 907	$ 4,165	$ 1,051,641	$ (201,236)